Table 4: Component structure of the $z_{\rm abs} = 1.776$ DLA system toward Q1331+17.
No. $z_{\rm abs}$ $v_{\rm rel}^*$ $b (\sigma_b)$ Ion $\log N (\sigma_{\log N})$ No. $z_{\rm abs}$ $v_{\rm rel}^*$ $b (\sigma_b)$ Ion $\log N (\sigma_{\log N})$
    km s-1 km s-1         km s-1 km s-1    
Low-ion transitions              
1 1.776336 -4 12.0 (0.3) Fe II 13.90 (0.04) 4 1.776724 +38 13.4 (0.8) Fe II 14.07 (0.02)
        Cr II 9.00 (0.25)         Zn II 11.50 (0.06)
        Ni II 12.82 (0.13)         Cr II 12.22 (0.06)
        Mn II 11.84 (0.06)         Ni II 12.87 (0.04)
        Mg II 11.00 (0.25)         Mn II 11.91 (0.01)
2 1.776370 0 9.8 (0.1) Fe II 14.16 (0.02)         Si II 14.60 (0.01)
        Zn II 12.35 (0.01)         S II 14.15 (0.11)
        Cr II 12.67 (0.01)         P II 12.41 (0.21)
        Ni II 12.89 (0.10)         N I <14.30
        Mn II 12.04 (0.03)         Mg II 14.99 (0.14)
        Si II 15.06 (0.01) 5 1.776859 +53 5.5 (0.3) Fe II 13.63 (0.05)
        Ti II 11.34 (0.10)         Zn II 11.43 (0.04)
        S II 14.88 (0.12)         Cr II 12.12 (0.05)
        P II 13.11 (0.04)         Ni II 12.58 (0.05)
        N I <15.16         Mn II 11.33 (0.04)
        Cl I 12.90 (0.03)         Si II 14.05 (0.03)
        Mg II 15.27 (0.12)         S II 14.05 (0.10)
3 1.776538 +18 6.0 (0.3) Fe II 13.46 (0.04)         P II 12.00 (0.30)
        Zn II 11.81 (0.02)         N I <12.82
        Cr II 12.07 (0.04)         Mg II 14.31 (0.26)
        Ni II 12.27 (0.10) 6 1.776964 +64 9.4 (0.9) Fe II 13.23 (0.07)
        Mn II 11.53 (0.02)         Si II 13.92 (0.05)
        Si II 14.40 (0.01)         N I <13.33
        S II 14.27 (0.07)            
        P II 12.19 (0.25)            
        N I <13.60            
        Cl I 12.50 (0.06)            
        Mg II 14.52 (0.19)            
1 1.776299 -8 15.0 (1.0) Mg I 11.72 (0.07) 4 1.776684 +34 8.6 (0.4) Mg I 11.83 (0.07)
2 1.776365 -0.5 6.0 (0.2) Mg I 12.08 (0.03) 5 1.776814 +48 9.1 (1.1) Mg I 11.85 (0.07)
        C I 13.12 (0.02) 6 1.776947 +62 3.0 (1.3) Mg I 11.39 (0.05)
3 1.776523 +17 3.4 (0.3) Mg I 11.77 (0.01)            
        C I 12.72 (0.02)            
Intermediate-ion transitions            
1 1.776036 -36 8.4 (0.4) Al III 12.03 (0.02) 4 1.776694 +35 15.1 (1.4) Al III 12.49 (0.04)
2 1.776300 -7 8.1 (1.1) Al III 12.29 (0.13) 5 1.776866 +54 7.2 (0.5) Al III 12.16 (0.06)
3 1.776414 +5 7.8 (1.4) Al III 12.29 (0.14)            
                       
$\textstyle \parbox{16.5cm}{ $^*$\space Velocity relative to $z=1.776370$ .}$


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